Carbon-offset additionality score API

Carbon-offset additionality score (0-100, higher = more additional) from a transparent rubric with explicit weights: financialAdditionality .35, regulatorySurplus .25, commonPracticeTest .20, barrierAnalysis .20 (each 0-1). Returns score, quality rating, A-F grade, and per-factor breakdown so the additionality claim is auditable. Answers 'is this offset additional', 'score additionality with financial/regulatory/common-practice tests', 'would this happen anyway'.

Price$0.016per request

MethodPOST

Route/v1/score/esg-additionality

StatusLive

MIME typeapplication/json

Rate limit120/minute

CacheNo cache

esgadditionalitycarbon-offsetcreditscoreclimate-financerubricverification

API URLhttps://x402.hexl.dev/v1/score/esg-additionality

Integration docs

Example request

{
  "financialAdditionality": 0.8,
  "regulatorySurplus": 0.7,
  "commonPracticeTest": 0.6,
  "barrierAnalysis": 0.75
}

Example response

{
  "additionalityScore": 72.5,
  "rating": "strong",
  "grade": "C",
  "breakdown": [
    {
      "factor": "financialAdditionality",
      "value": 0.8,
      "weight": 0.35,
      "contribution": 28
    },
    {
      "factor": "regulatorySurplus",
      "value": 0.7,
      "weight": 0.25,
      "contribution": 17.5
    },
    {
      "factor": "commonPracticeTest",
      "value": 0.6,
      "weight": 0.2,
      "contribution": 12
    },
    {
      "factor": "barrierAnalysis",
      "value": 0.75,
      "weight": 0.2,
      "contribution": 15
    }
  ]
}

Input schema

{
  "type": "object",
  "required": [
    "financialAdditionality",
    "regulatorySurplus",
    "commonPracticeTest",
    "barrierAnalysis"
  ],
  "properties": {
    "financialAdditionality": {
      "type": "number",
      "description": "Financial additionality 0-1",
      "examples": [
        0.8
      ]
    },
    "regulatorySurplus": {
      "type": "number",
      "description": "Regulatory surplus / beyond-mandate 0-1",
      "examples": [
        0.7
      ]
    },
    "commonPracticeTest": {
      "type": "number",
      "description": "Common-practice test pass 0-1",
      "examples": [
        0.6
      ]
    },
    "barrierAnalysis": {
      "type": "number",
      "description": "Barrier analysis strength 0-1",
      "examples": [
        0.75
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}